Multiband High-Frequency Circuit for Simultaneous Wireless LAN and Bluetooth Operation
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Solution Overview
Problem
Current wireless communication systems are limited in their ability to operate seamlessly across multiple standards, specifically IEEE802.11b/g for 2.4-GHz wireless LAN, Bluetooth, and IEEE802.11a/h for 5-GHz wireless LAN, requiring separate circuits for each frequency band and lacking a solution for simultaneous operation across all three.
Innovation Solution
A multiband high-frequency circuit design that incorporates a first high-frequency switch circuit, diplexer circuits with filter configurations, and balanced-unbalanced conversion circuits to enable simultaneous operation across IEEE802.11b/g, Bluetooth, and IEEE802.11a/h systems, utilizing a laminate substrate with integrated circuit elements and semiconductor components for miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuits are used for each frequency band (2.4-GHz wireless LAN, Bluetooth, 5-GHz wireless LAN), then each circuit can be optimized for its specific standard, but the device complexity and component count increase significantly
Solution Approach 1:
The patent implements a universal high-frequency circuit that can operate across multiple frequency bands (2.4-GHz and 5-GHz) and support multiple communication standards (wireless LAN and Bluetooth) through a single integrated architecture. The circuit uses switchable filter configurations and diplexer arrangements to adapt to different standards while maintaining optimized performance for each, thereby reducing the need for separate dedicated circuits for each frequency band.
2Reliability
If separate circuits are used for each frequency band, then each circuit can be independently designed, but the overall device size increases
Solution Approach 1:
The patent merges multiple frequency band handling capabilities into a single integrated high-frequency circuit. By combining 2.4-GHz and 5-GHz band processing, along with wireless LAN and Bluetooth functionality, into one circuit module with shared components (switches, diplexers, filters), the device achieves independent design capability for each standard while maintaining a compact form factor that would be impossible with completely separate circuits.
3Reliability
If multiple separate circuits are implemented, then each communication standard can be optimized, but the manufacturing cost and assembly complexity increase
Solution Approach 1:
The universal high-frequency circuit is designed as a single manufacturable unit that incorporates all necessary components (switches, diplexers, filter banks) to support multiple standards. This approach allows for standardized manufacturing processes and assembly procedures, reducing the complexity that would arise from assembling and integrating multiple separate circuits, while still maintaining the ability to optimize performance for each specific communication standard.
Data Source
AI summary
A multiband high-frequency circuit comprising a first switch SPDT1 for switching the connections of a multiband antenna to transmitting circuits 11bg-T, 11a-T and receiving circuits 11bg-R, 11a-R of first and second communications systems, and a transmitting/receiving circuit BLT-TR of a third communications system, a diplexer circuit Dip1 for branching a high-frequency signal to 11a-R and 11bg-R or BLT-TR and a diplexer circuit Dip2 for branching a high-frequency signal to 11bg-T and 11a-T, both of which are disposed downstream of SPDT1, each diplexer circuit Dip1, Dip2 comprising a lower-frequency-side filter and a high-frequency-side filter, a bandpass filter BPF1 being disposed downstream of the lower-frequency-side filter of the diplexer circuit Dip1, and a second switch SPDT2 being disposed downstream of the bandpass filter BPF1.